this is being sold as a cosmetic flaw: black marks caused by impurities in the clay are visible on the edge of the coaster, please see photos
The black marks are caused by impurities in the clay, they aren't visible when I decorate the mug but become visible after the transfer firing.
Hand decorated using digital transfers of my watercolour illustrations of a hedgehog and toadstool. My illustrations are professionally printed onto ceramic transfers which I apply by hand to each coaster composing the design as I go. They have a slight rim so are also equally suitable to use as a spoon rest.
After decorating the coasters are fired in my own small electric kiln to 800°C making them dishwasher safe.
Dimensions:
8.5cm diameter